Crows remember the faces of threatening humans and often react by scolding and bringing in others to mob the perceived threat (you)!

This, according to a new study published in the latest Proceedings of the Royal Society B.

And since the mob members also then indirectly learn about the threatening person, the findings demonstrate how just a single crow's bad experience with a particular human can spread information about this individual throughout entire crow communities.

Given that crows have impressive memories, people who ruffle the feathers of these birds could experience years of retribution.